Assume you are totally unprepared for a quiz, but you decide to take it anyway and just guess

| November 18, 2015

Assume you are totally unprepared for a quiz, but you decide to take it anyway and just guess at all of the answers. The quiz is 15 multiple-choice questions, each of which has five choices (that’s 1 in 5 chances of getting one right). What is the probability that you will pass the quiz if you need at least 9 questions correct in order to pass?

a. 0.0001 

b. 0.0008 

c. 0.1415 

d. 0.1032 

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Suppose I am interested in the average height of college students.

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